[SDMU-352] Can an older sister who loves her cute little brother during a family trip do "forbidden virgin brush writing" in the family open-air bath? ?? (Censored)

<p>SOD, which has fulfilled her sister&#39;s wish to get along with her favorite younger brother, has decided to take off for her sister who wants to shorten the distance with her younger brother at once on a family hot spring trip during the summer vacation. !! Mixed bathing with my family for the first time in years ... Even though my parents are by my side, I know that my sister isn&#39;t cool, but I wonder if she will &quot;incest&quot; with her younger brother! ??</p>